How far are you in the game? You should have access to them any time you can swap weapons, the first time would be at the beginning of the mars mission at the squad equip screen. Just make sure you don't put the acolyte or the executioner on shepard for that mission, that can cause some problems.---All your base are belong to us

I'm at the part where you get Garrus for the first time and are taking on Brutes.I haven't been able to equip them at all, I haven't received the e-mails from Liara either.Its a shame what they did to the Viper though, I loved that gun in ME2.:'{Maybe I have to restart the game?